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A late Eemian aridity pulse in central Europe during the last glacial inception

机译:最后一次冰川爆发期间中欧地区晚一次的Eemian干旱脉冲

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Investigating the processes that led to the end of the last interglacial period is relevant for understanding how our ongoing interglacial will end, which has been a matter of much debate ( see, for example, refs 1,2). A recent ice core from Greenland demonstrates climate cooling from 122,000 years ago(3) driven by orbitally controlled insolation, with glacial inception at 118,000 years ago(4-8). Here we present an annually resolved, layer-counted record of varve thickness, quartz grain size and pollen assemblages from a maar lake in the Eifel ( Germany), which documents a late Eemian aridity pulse lasting 468 years with dust storms, aridity, bushfire and a decline of thermophilous trees at the time of glacial inception. We interpret the decrease in both precipitation and temperature as an indication of a close link of this extreme climate event to a sudden southward shift of the position of the North Atlantic drift, the ocean current that brings warm surface waters to the northern European region. The late Eemian aridity pulse occurred at a 65 degrees N July insolation of 416 W m(-2), close to today's value of 428 W m(-2) ( ref. 9), and may therefore be relevant for the interpretation of present-day climate variability.
机译:调查导致最后一个冰期之间过程的过程与理解我们正在进行的冰期将如何结束有关,这是一个充满争议的问题(例如,参见参考文献1,2)。格陵兰岛最近的一个冰芯显示了受轨道控制的日照驱动的122,000年前(3)的气候降温,以及118,000年前(4-8)的冰川开始。在这里,我们提供了一份年度解析的层数记录,记录了埃菲尔(德国)一个玛尔湖的脉管厚度,石英晶粒大小和花粉组合,记录了一个持续了468年的艾米亚晚期干旱脉动,包括沙尘暴,干旱,丛林大火和冰川开始时嗜热树木的数量下降。我们将降水量和温度的下降解释为这种极端气候事件与北大西洋漂流位置突然向南移动的密切联系的指示,北大西洋漂流是将温暖的地表水带到北欧地区的洋流。早期的Eemian干旱脉冲发生在北纬65度的7月日照下416 W m(-2),接近今天的428 W m(-2)(参考文献9),因此可能与对当前天的气候变化。

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